fix: Show Connection Toast when at least one account is connected to Dapp

[NidhiKJha]

This PR ensures that the connection toast is shown when at least one account is connected to the Dapp. If no account is connected, then the Toast to connect accounts should not be displayed

Related issues

Fixes: #32045

Manual testing steps

1. Run extension
2. Open the Dapp, and MM in popup view. No toast should show
3. Connect MM to Dapp
4. Switch to the second account
5. Toast should appear

Screenshots/Recordings

Before

After

When Dapp is not connected

Screen.Recording.2025-04-23.at.3.46.19.PM.mov

When Dapp is connected

Screen.Recording.2025-04-23.at.3.47.13.PM.mov

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[metamaskbot]

Builds ready [2087ca6]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• bundle size: Bundle Size Stats
• user-actions-benchmark: User Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all CircleCI artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
  • content-script: 0
  • offscreen: 0

UI Startup Metrics (1245 ± 69 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Home	uiStartup	1245	1067	1411	69	1299	1365
			load	1078	949	1239	67	1132	1200
			domContentLoaded	1072	945	1234	67	1120	1195
			domInteractive	19	13	72	10	17	30
			firstPaint	757	134	1244	418	1095	1186
			backgroundConnect	7	4	18	2	7	12
			firstReactRender	22	16	55	6	21	35
			getState	13	4	65	10	19	29
			initialActions	0	0	1	0	0	0
			loadScripts	834	717	992	64	881	949
			setupStore	8	5	16	2	8	13
	Webpack	Home	uiStartup	2193	1745	2673	172	2274	2438
			load	1702	1347	2120	144	1823	1913
			domContentLoaded	1696	1344	2108	143	1815	1909
			domInteractive	17	11	72	11	14	42
			firstPaint	197	68	687	88	250	330
			backgroundConnect	29	10	227	28	28	64
			firstReactRender	219	55	395	125	344	372
			getState	14	4	176	18	16	29
			initialActions	3	1	8	1	4	6
			loadScripts	1691	1342	2083	142	1812	1907
			setupStore	22	7	224	28	23	41
Firefox	Browserify	Home	uiStartup	1387	1205	1698	105	1454	1625
			load	1233	1055	1565	109	1297	1468
			domContentLoaded	1233	1054	1565	109	1296	1468
			domInteractive	105	40	318	36	117	153
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	23	14	137	16	23	42
			firstReactRender	24	19	55	6	24	32
			getState	8	4	41	5	8	13
			initialActions	0	0	1	0	0	1
			loadScripts	1212	1040	1547	108	1273	1387
			setupStore	6	4	31	4	6	9
	Webpack	Home	uiStartup	1517	1343	2127	135	1589	1800
			load	1297	1146	1772	117	1375	1514
			domContentLoaded	1297	1145	1771	117	1374	1514
			domInteractive	82	43	162	21	96	122
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	23	14	100	12	23	42
			firstReactRender	36	28	96	10	38	49
			getState	9	4	30	5	9	21
			initialActions	0	0	6	1	1	1
			loadScripts	1276	1129	1754	117	1349	1494
			setupStore	8	5	61	7	8	16

cc: @HowardBraham
Benchmark value 1246 exceeds gate value 1234 for chrome browserify home mean uiStartup
Benchmark value 1079 exceeds gate value 1070 for chrome browserify home mean load
Benchmark value 1073 exceeds gate value 1061 for chrome browserify home mean domContentLoaded
Benchmark value 834 exceeds gate value 830 for chrome browserify home mean loadScripts
Benchmark value 1200 exceeds gate value 1190 for chrome browserify home p95 load
Benchmark value 1195 exceeds gate value 1180 for chrome browserify home p95 domContentLoaded
Benchmark value 1186 exceeds gate value 1180 for chrome browserify home p95 firstPaint
Benchmark value 949 exceeds gate value 940 for chrome browserify home p95 loadScripts
Benchmark value 2193 exceeds gate value 2192 for chrome webpack home mean uiStartup
Benchmark value 372 exceeds gate value 370 for chrome webpack home p95 firstReactRender
Sum of mean exceeds: 38ms | Sum of p95 exceeds: 42ms
Sum of all benchmark exceeds: 80ms

Bundle size diffs

• background: 0 Bytes (0%)
• ui: 12 Bytes (0%)
• common: 0 Bytes (0%)